Help with temperature Thermodynamics

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hogeboon1
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1)
A stream of 0.3 kg/s of ammonia enters an insulated nozzle at 20C, 800 kPa at negligible velocity. The ammonia exits
at 300 kPa with a velocity of 500 m/s. Determine the temperature (or quality, if saturated) and the exit cross-sectional
area of the nozzle. [5 points]

2)
velocity V =volumetric flowrate/cross-sectional area of pipe or nozzle= p/mA p=rou

I have no clue how to start this, my teacher doesn't give us enough information on how to do the hw. Any help would be appreciated
 
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